Detailed explanation: several types of bearings

Deep groove ball bearings, angular contact ball bearings, four-point contact ball bearings, self-aligning ball bearings, tapered roller bearings, cylindrical roller bearings, spherical roller bearings, these types of bearings are all over, the use is common, the model How many kinds of tens of thousands of species, let us briefly introduce the construction of these types of bearings, advantages and limitations of the use of the industry.

Deep groove ball bearing
The most representative rolling bearing is of common use. Radial load and bidirectional axial load are acceptable. It is used in places where high-speed torsion and low noise and low vibration are required. Sealed bearings with steel dust caps or rubber seals are pre-filled with excess smooth grease and bearings with snap rings or flanges on the outer ring for easy axial positioning and for easy installation in the housing. The size of the maximum load bearing is the same as that of the standard bearing, but there is a filling groove in the inner and outer rings, adding the number of balls to be loaded, and the additional load is mainly used for the support frame and the steel plate stamping frame (waveform, crown shape...single row; S Shape...double column)
The copper alloy or phenolic resin is cut and adhered to the frame to form a resin forming holder.
Primary use:
Automotive: rear wheels, transmissions, electrical installation components
Electrical: General Electric Ideas, Household Appliances
Others: instruments, internal combustion engines, construction machinery, railway vehicles, loading and unloading machinery, agricultural machinery, various types of property machinery
  Angular contact ball bearings
There is a contact angle between the ferrule and the ball. The standard contact angle is 15°, 30° and 40°. The larger the contact angle, the larger the axial load. The smaller the contact angle, the better the high-speed twist. Single row bearings can accept radial load and one-way axial load. DB combination, DF combination and double row bearings can accept radial load and bidirectional axial load. DT group is suitable for one-way axial load, and additional for single bearing. A place with a lack of load. The high-speed ACH type bearing has small ball diameter and many ball numbers, and is mostly used for machine tool spindles; angular contact ball bearings are used for high-speed and high-precision torsion, and two single-row angular contact ball bearings with reverse combination are constructed to share inner and outer rings. It can accept radial load and bidirectional axial load, and the non-filled groove bearing is also sealed.
The first common use of the support frame: steel stamping adhere to the frame (bowl shape...single row; S-shaped, crown-shaped...double row), copper alloy or phenolic resin cutting and holding frame, forming resin forming and holding frame.

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Domestic and foreign bearing test methods

At present, there are four main types of bearing test methods at home and abroad:
First, friction and wear test;
Second, the test bench test;
Third, the laboratory (test site) simulation test;
Fourth, the actual working conditions of the test.

Foreign countries have used the above several test methods, but the application purpose is different. For example, to develop a brand new product, firstly, a friction and wear test must be performed. However, if there is not much change in the form of friction and wear, only the product size and load conditions change, only the bench, simulation or actual running test is needed. Foreign countries have very strict assessments of new products (such as car wheel bearings, etc.) in key parts, and must be tested in actual operation before they can be approved for use. Swedish SKF bearings, Japan NTN bearings, newly researched bearing simulation test technology, can only replace benches, simulations or experiments, to shorten the time of product design, speed up the progress of product development, but there is still a gap from the actual operation. At present, China's bearing industry has carried out friction and wear tests, only one of Luoyang Bearing Research Institute; has carried out bearing bench test, including Luoyang Bearing Research Institute, Shanghai Axis Research Institute, Hangzhou Bearing Test Center and Wafangdian, Harbin, etc. Yujiaguo has bearing enterprises; Luoyang Bearing Research Institute, Hangzhou Bearing Test Center, Luozhou, Xenxi and other enterprises can be launched for simulation test. In order to carry out the actual test, the bearing manufacturer will only carry out the requirements when the supporting mainframe enterprise puts forward this aspect, such as the wheel bearing of the railway passenger wheel to the bearing and the car. In short, the domestic implementation of simulation and actual operation test is not extensive, and should further expand the scope of the host or the actual working conditions, and prepare sufficient software and hardware for the simulation test to mention the schedule as soon as possible.

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